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. that is available energy for very heavy rain. you with me? >> i'm with you. >> oat warmer the air, the more water vapor it hold. cold air can't hold a lot of water vapor. the polar regions, i know they are covered in snow and ice but parts of the polar regions only get about an inch of snow a year. cold air can't hold much water vapor at all. they don't get much in wait of rain and/or snow. still following me? >> is that why sometimes when it snows a lot, we all say it feels warmer though. >> he y a -- yes, a whole different question. we have those two principles in place. just because the air is warm or hot though, it does not mean that we've got a lot of moisture. we see that the deserts of the u.s. in the southwest. it is 110 in phoenix but it never rains. so you need a combination. here is what you really want for very heavy rainfall. you want a air mass in place or ingredients for a large temperature gradient. on one side of the front, you might want temperature in the 80s or 90s with a lot of moisture available and on the other side of the front, much cooler air because that cooler air can
Search Results 0 to 0 of about 1